Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Method for estimating sampling clock skew based on orthogonal frequency division multiplexing system

A sampling clock and orthogonal frequency division technology, applied in the field of digital signal transmission, can solve problems such as insufficient stability and complex calculation methods, and achieve the effect of reducing implementation complexity, high estimation accuracy and stability

Active Publication Date: 2010-02-03
FUZHOU ROCKCHIP SEMICON
View PDF0 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This calculation method is not only complicated, but also not stable enough

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for estimating sampling clock skew based on orthogonal frequency division multiplexing system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0019] In the OFDM receiving system, there is generally a symbol timing synchronization module to calculate the offset of the starting position of the OFDM symbol and perform compensation. In the capture state (a fixed period of time), the offset of the starting position of the OFDM symbol calculated by the symbol timing synchronization module (a positive value indicates that the timing is ahead, and a negative value indicates that the timing is behind) is accumulated to calculate this period of time The total offset points OffsetSum of the starting position of the OFDM symbol are divided by the total sampling points SampSum during this period to obtain the offset ratio of the sampling clock (a positive value indicates that the sampling clock is too fast, and a negative value indicates that the sampling clock is skewed). Slow), use it to compensate the sampling clock, and clear OffsetSum to zero.

[0020] Then it enters the tracking state of sampling clock offset estimation, a...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention relates to a method for estimating sampling clock skew based on an orthogonal frequency division multiplexing (OFDM) system. The method comprises the following steps: firstly analyzing the skew of a timed value in a period of fixed time to capture a skew value of a sampling clock, then tracking the skew of the sampling clock, and fine tuning the skew of the sampling clock after accumulating the skew of the timed value to a threshold value. The method directly uses a sign timing synchronous result for computation, reduces the realization complexity and has high estimated accuracyand stability.

Description

【Technical field】 [0001] The invention belongs to the field of digital signal transmission, in particular to a method for estimating sampling clock offset based on an Orthogonal Frequency Division Multiplexing (OFDM) system. 【Background technique】 [0002] The synchronization part of the OFDM receiver mainly includes frequency synchronization, sampling clock synchronization and symbol timing synchronization. For OFDM receivers, the sampling clock deviation will cause signal phase rotation and amplitude attenuation, destroy the orthogonality between OFDM subcarriers, and reduce system performance; at the same time, it will also cause the increase or decrease of sampling points, affecting some synchronization algorithms usage of. Therefore, the estimation and compensation of the sampling clock offset is very important in the OFDM receiving system. [0003] At present, the estimation of the sampling clock offset by the OFDM receiving system is mostly calculated according to t...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): H04L27/26
Inventor 张善旭夏海军
Owner FUZHOU ROCKCHIP SEMICON
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com